True, although Amazon and Netflix at least have done large stock buybacks, which are theoretically equivalent except for tax incidence. So they have returned capital to investors. I didn't check for the others, maybe they did too.
Sure, but Anthropic never announced that it will never return capital to investors; did it?
I think this S-1 is about as close as you can get to announcing such a policy. It doesn't literally commit them to never returning capital, but it appears to block off or rule out pretty much any chance of them doing so via various means.